Method of making tires for carpet sweepers



WVJ. KENT METHOD OF MAKING TIRES FOR CARPET SWEEPERS F1 1 6d Feb. 21, 1920 5 nvamto'c.

atente h sh, ll l application dled February at, lllttl. lterla'l the. states.

To all whom itmag concern."

Be it known that T WILLIAM J. KENT, a citizen of the United @tates, residing at Broolrl n, county of Kings, and @tate of a New orlr, have invented certain new and useful Improvements in Methods of Idahin Tires for Carpethweepers, of which thefo lowing is a full, clear, and exact description. This invention relates to a method of it malting tires forcarpet sweepers or vacuum cleaners.

The tiresfor carpet sweepers andvacuum cleaners as ordinarily made are small rubber rings havinga roughened outer surface or.

it tread, which is essential, as in many of them parts of the mechanism are driven by thewheels on which these tires are mounted. it is therefore necessarythat there be a good frictional contact with the surface over which the machine is being run. By the pre viously knownmethod these tires are made by forming a tube of rubber on a plain mandrel, wrapping it with a heavy grade of canvas, and vulcanizing. This heavy canvas as orduck, owing to its rough surface, forms a rough outer surface on the tube. vulcanizing, the canvas is stripped from the tube, the latter removed from the mandrel,

and cut into small sections of suitable size so to fit the wheels of the carpet sweepers. This method is very expensive, as the canvas can be used for a short time only before bein scrapped, and the grade use is very hig riced. p The object of the present invention is to devise a method for mahingcarpet sweeper tires or analogous articles in a simple. and inexpensive manner, while retaining all. the advantages obtained by the use of the cantt vas. s

lin the drawings, Fig. 1 is a perspective of a mandrel used 1n carrying out my method, showing abrolten-away ru ber tube thereon, Fig. 2 is a perspective of a finished tire '2, and vulcanized in the or After Tn carrying out my method a tube 1 of at rubber is formed upon a rou hened mandrel inary manner. The tube is then stripped from the mandrel, and cut into sections of the required size to form the tire, which are then turned inside so out, as shown at 3'in Fig. 2. lin'certain conditions it may be desirable to make'the tubes or rings 1 of the size required in the finished article, particularly in the case where they are to be of considerable length, and in this eventthe step of cutting the tube into proper sizes will be unnecessary. lit is obvious that the surface of the man rel may-be given any roughened confi ration that will reduce the desired trea onthe finished an inverttr ed tube. Y J ile thismethod is particularly designed to produce tires for carpet sweepers or vacuum cleaners, it is obvious that it is of more general application and may be used whenever it is desired to produce a ring hav-. ing a roughened outer surface adapted for frictional contact, such as the small, soft rubber rin s placed on the finger knobs at the ends 0 other purpose requiring such rings,

Having thus described my-invention, what 1 T claim and desire to protect by Letters Patent is:

The method of melting rubber tires for. car et sweepers, whichcomprises formin an final curing arelatively lon and uniform gage rubber tube on a man rel adapt" ed to give to. the inner surface of the tube I the desired tread configuration, stripping the as tube from the mandrel, cutting the tube into' portions of the desired width, and inverting each portion to present its roughened inner surface as an outer tread surface and form a completed tire. v @igned at New Torlt city, ew Yorlr, this Lllddllll J. KENT ll 0. 16th day of Febru 92 typewriterplatens, or for any 7t 

